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Pacific Banana Slug
Ariolimax columbianus
19,770 observations
Horned Nudibranch
Hermissenda crassicornis
10,978 observations
Black Slug
Arion ater
5,512 observations
Frilled Dogwinkle
Nucella lamellosa
4,042 observations
Pacific Sideband
Monadenia fidelis
3,689 observations
Monterey Dorid
Doris montereyensis
3,499 observations
Leopard Slug
Limax maximus
3,349 observations
Lewis's Moon Snail
Neverita lewisii
3,294 observations
Brown-lipped Snail
Cepaea nemoralis
3,288 observations
White-lined Dirona
Dirona albolineata
3,188 observations
Garden Snail
Cornu aspersum
2,578 observations
Lined Chiton
Tonicella lineata
2,155 observations
Mossy Chiton
Mopalia muscosa
2,104 observations
Nuttall's Cockle
Clinocardium nuttallii
1,943 observations
Giant Nudibranch
Dendronotus iris
1,856 observations
barnacle-eating dorid
Onchidoris bilamellata
1,852 observations
Northern Leopard Dorid
Diaulula odonoghuei
1,756 observations
White-and-orange-tipped Nudibranch
Antiopella fusca
1,608 observations
Branched Dendronotid
Dendronotus venustus
1,480 observations
Hooded Nudibranch
Melibe leonina
1,393 observations
Oregon forestsnail
Allogona townsendiana
1,356 observations
Woody Chiton
Mopalia lignosa
1,293 observations
Gumboot Chiton
Cryptochiton stelleri
1,275 observations
Three-lined Aeolid
Orienthella trilineata
1,265 observations
Red Sponge Dorid
Rostanga pulchra
1,230 observations
Purple Mahogany Clam
Nuttallia obscurata
1,101 observations
Modest Clown Dorid
Triopha modesta
1,074 observations
Striped Dogwinkle
Nucella ostrina
1,067 observations
Nanaimo Dorid
Acanthodoris nanaimoensis
1,058 observations
Milky Slug
Deroceras reticulatum
1,012 observations
Black Leather Chiton
Katharina tunicata
945 observations
Robust Lancetooth Snail
Haplotrema vancouverense
940 observations
Noble Dorid
Peltodoris nobilis
914 observations
East Pacific Red Octopus
Octopus rubescens
847 observations
California Mussel
Mytilus californianus
831 observations
Rough Keyhole Limpet
Diodora aspera
804 observations
Yellow-bordered Taildropper
Prophysaon foliolatum
796 observations
Green Falsejingle
Pododesmus macrochisma
778 observations
Opalescent Inshore Squid
Doryteuthis opalescens
747 observations
Rocky Aeolid
Eubranchulus rupium
715 observations
Coryphella longicaudata
Coryphella longicaudata
703 observations
Rough Piddock
Zirfaea pilsbryi
604 observations
Northwest Hesperian
Vespericola columbianus
603 observations
Heath's Dorid
Geitodoris heathi
582 observations
Hedgpeth's Sapsucker
Elysia hedgpethi
568 observations
Striped Nudibranch
Armina californica
562 observations
Pacific Oyster
Magallana gigas
561 observations
Pacific Razor Clam
Siliqua patula
550 observations
British Columbia Aeolid
Tenellia columbiana
536 observations
Butter Clam
Saxidomus gigantea
523 observations
Frequently Asked Questions
- The 10 most common molluscs in Washington are:
- Pacific Banana Slug (Ariolimax columbianus)
- Horned Nudibranch (Hermissenda crassicornis)
- Black Slug (Arion ater)
- Frilled Dogwinkle (Nucella lamellosa)
- Pacific Sideband (Monadenia fidelis)
- Monterey Dorid (Doris montereyensis)
- Leopard Slug (Limax maximus)
- Lewis's Moon Snail (Neverita lewisii)
- Brown-lipped Snail (Cepaea nemoralis)
- White-lined Dirona (Dirona albolineata)
- The most observed mollusc in Washington is Pacific Banana Slug (Ariolimax columbianus), with 19,770 recorded observations.